/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraSystem.h
Adds a new emitter handle to this system without copying the original asset. This should only be used for temporary systems and never for live assets.
void AddEmitterHandleDirect ( [FNiagaraEmitterHandle](API\Plugins\Niagara\FNiagaraEmitterHandle) & EmitterHandleToAdd )